Exercise:

1.

Exercise:

2.

Exercise:

3.

Exercise:

4.

Exercise:

5.

Exercise:

6.

Exercise:

7.

Exercise:

8.

Exercise:

9a.

Exercise:

9b.

Exercise:

10a.

Exercise:

10b.

Exercise:

11a.

Exercise:

11b.

Exercise:

12a.

Exercise:

12b.